Honeywell T834C2267 User's Manual
Contents
1. hookup diagrams If using electric heat compatible thermo stat in central electric heat applications jumper terminals and 2 to control fan operation from the thermostat during heating See Fig 2 Fig 2 Jumpering thermostat terminals to control fan operation JUMPER A IN ELECTRIC HEAT AND HEAT PUMP APPLICATIONS JUMPER TERMINALS 1 AND 2 FOR AUTOMATIC FAN CONTROL IN HEATING AND COOLING A IN GAS AND OIL FIRED APPLICATIONS JUMPER TERMINALS 1 AND Y FOR AUTOMATIC FAN CONTROL IN COOLING uai 5 Remove thermostat cover by pulling outward on bot tom edge until it snaps free of the thermostat base Carefully remove and discard the foam plastic shipping insert This insert protects the switch and bimetal assembly during ship ping 6 Push excess wire back through the hole and plug any opening with insulation to prevent drafts that may affect thermostat performance 7 Fasten the thermostat to the wall or outlet box with a screw through the top mounting hole Adjust the thermostat so that it is approximately level and fasten the second screw through the bottom mounting hole Do not tighten 8 Exactly level the thermostat using a spirit level or plumb line Tighten the mounting screws Fig 3 Internal schematic and typical hookup for T834C1137 and T834C2308 in a standard heating cooling system SWITCH H1 ANTICIPATOR OFFO C2. 10 F 6 C above room temperature Gas or oil fired systems heating should start fan should start after a short delay Single stage heat pump or central electric heat sys tems both heating and fan should start immediately Move temperature setting lever 10 F 6 C below room temperature Gas or oil fired systems heating should shut off and fan should shut off after a short delay Single stage heat pump or central electric heat sys tems heating and fan should shut off immediately COOLING N CAUTION Do not operate cooling if outdoor temperature is below 50 F 10 C Refer to manufacturer s recommendations NOTE To prevent compressor shortcycling some manufac turers equipment includes a minimum off timer to pro vide a five minute time delay before activating the com pressor when the thermostat last turned the compressor off or from when the system first received power This delay protects the compressor With the system switch set at COOL and the fan switch set at AUTO move the temperature setting lever about 10 F 6 C below room temperature Cooling and fan should start see NOTE above Move the temperature setting lever about 10 F 6 C above room temperature Cooling and fan should shut off FAN With the system switch set at OFF and the fan switch at ON the fan should run continuously Move the fan switch to AUTO In gas or oil fired systems fan operation is con tr
3. CHANGEOVER RELAY HEAT O EX A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A JUMPER 1 2 FOR AUTO FAN IN HEATING AND COOLING ELECTRIC HEAT AND SINGLE STAGE HEAT PUMP SYSTEMS A JUMPER 1 Y FOR AUTO FAN IN COOLING ONLY A JUMPER W Y FOR SINGLE STAGE HEAT PUMP APPLICATIONS M2323B 3 69 0434 5 9 Adjust temperature setting lever so mercury bulb is in horizontal position See Fig 1 10 Carefully replace thermostat cover IMPORTANT An incorrectly leveled thermostat will cause the temperature control to deviate from setpoint Setting and Adjustment TEMPERATURE SETTING Push the temperature setting lever to the desired control point on the temperature scale The same lever controls both heating and cooling SYSTEM AND FAN SWITCHING The T834C features SYSTEM and FAN switches for control of the heating cooling and fan systems The SYSTEM switch controls system operation as fol lows HEAT Heating system only operates OFF Both heating and cooling control systems are dis connected COOL Cooling system only operates The FAN switch controls fan operation as follows AUTO For gas or oil fired systems the fan operates in response to the thermostat in cooling fan operates in response to the plenum fan control in heating For single stage heat pump and electric heat systems the fan operates in response to the thermostat in both heating and cooling ON The fan runs continuously T
4. OFF O COOL _ HEAT COOL 5 Lo r FAN SWITCH HOT eS FAN RELAY L2 ON M om A FN co AUTO _ TEMP FALL 1 COMPRESSOR ANTICIPATOR CONTACTOR SYSTEM HEAT HEAT RELAY A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED M1119A Fig 4 Internal schematic and typical hookup for T834C1541 in gas or oil fired or central electric heat system L1 gt HoT gt 12 FAN SWITCH FAN RELAY ON z Ht 4 FN G AUTO YY TEMP FALL 7 AD A COMPRESSOR Ht ct l CONTACTOR ANTICIPATOR ANTICIPATOR s Fe Erg if SYSTEM T SWITCH COOL HEAT oFF _ C OFF y HEAT COOL HEAT RELAY G E A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A IN ELECTRIC HEAT OR SINGLE STAGE HEAT PUMP APPLICATION JUMPER 1 AND 2 FOR AUTO FAN IN HEATING AND COOLING M2690 Fig 5 Internal schematic and typical hookup for T834C2267 in gas or oil fired single stage heat pump or central electric heat system l l i FAN RELAY FAN LGH SWITCH Per l l AUTO l l i A u E HR i gt HOT er o CHANGEOVER H1 RELAY COOL ai oft TEMP FALL A C L e 2 l l H1 c1 i ANTICIPATOR ANTICIPATOR f SYSTEM l HEAT RELAY T e OB J COOL HEAT iis oFF C oFF N A COMPRESSOR HEAT COOL RELAY OE WS hg
5. Honeywell TRADELINE T834C Heating Cooling Thermostat Application T834C Thermostats control 24 to 30 Vac single stage heating cooling systems See Table 1 for specific models and applications An spdt mercury switch makes R to W on atemperature fall for heating and R to Y ona temperature rise for cooling See Fig 1 TABLE 1 THERMOSTAT MODELS AND APPLICATIONS Heat Model Switching Anticipator See Number Application System Fan Range Comments Fig T834C1137 For use in standard HEAT OFF ON AUTO 0 18 to 10A TRADELINE Beige 3 heating cooling COOL systems T834C1541 For use in gas or SUPER TRADELINE 4 oil fired or central Beige electric heat systems T834C2267 For use in gas or SUPER TRADELINE 5 oil fired single stage Premier White heat pump or central Jumper included electric heat systems T834C2309 For use in standard 0 3to1 2A TRADELINE Beige 3 heating cooling systems Tn electric heat applications without fan sequencers jumper terminals 1 and 2 to control the fan from the thermostat during heating Fig 1 Internal view of T834C MOUNTING HOLE THERMOSTAT TO WALL OR OUTLET BOX BIMETAL ELEMENT BEHIND SCALE FAN SWITCH ADJUSTABLE HEAT ANTICIPATOR INDICATOR ieee SWITCH MOUNTING HOLE TEMPERATURE SETTING LEVER A FAN SWITCH AVAILABLE ON T834C ONLY M8676 Recycling Notice This contr
6. al or thermometer 3 Move the setting lever to a low setting Wait at least five minutes for temperature to stabilize 4 Slowly move the setting lever until it reads the same as the thermometer 5 Remove cover Holding the setting lever so it does not move reinsert wrench and carefully turn counterclockwise until the mercury drops to the left of the tube but no farther 6 Recheck calibration Set the thermostat system switch for desired operation and replace cover 7 Adjust temperature setting lever so mercury bulb is in position See Fig 1 8 Carefully replace thermostat cover Fig 6 Recalibration procedure COIL SHOWN WITHOUT HEAT ANTICIPATOR oe CALIBRATION WRENCH M2044 69 0434 5 Honeywell Automation and Control Solutions Honeywell Internationals Inc Honeywell Limited Honeywell Limit e 1985 Douglas Drive North 35 Dynamic Drive Golden Valley Minnesota 55422 Scarborough Ontario M1V 4Z9 Printed in U S A on recycled paper containing at least 10 post consumer paper fibers
7. e sun fireplaces or appliances unheated uncooled areas behind the thermostat such as outside walls This thermostat is a precision instrument and was care fully adjusted at the factory Handle it carefully MOUNTING AND WIRING Disconnect power supply before beginning installation to prevent electrical shock or equipment damage All wiring must comply with local codes and ordinances The T834C can be mounted directly to a wall or vertical outlet box Use Honeywell part no 193121A beige or 202689A gray Mounting Plate Assembly order sepa rately to mount on horizontal outlet box or cover marks left by old thermostat If mounting plate assembly is used review instructions provided with assembly before wiring and mount ing thermostat To wire and mount thermostat 1 In replacement applications check the existing ther mostat wires for cracked or frayed insulation Replace any wires in poor condition If the wire is plastered into the wall make ahole next to the wires and loosen the wires so that they can be pushed back into the wall later 2 In new installations run wiring if necessary to the thermostat location 3 Set the adjustable heat anticipator indicator to match the current draw of the primary heating control or as recom mended by the equipment manufacturer see Heat Anticipa tor Setting 4 Connect the wires to the terminals on the back of the thermostat See Figs 3 5 for internal schematic and typical
8. o switch positions use thumb and index finger to slide lever to desired position Switch lever must stop directly over desired function indicator mark for proper circuit operation HEAT ANTICIPATOR SETTING IMPORTANT The T834C Thermostat has an adjustable heat anticipator and equipment will cycle properly ONLY IF THE ANTICIPATOR IS ADJUSTED TO MATCH THE CURRENT DRAW OF THE ENTIRE SYSTEM or as recommended by the equipment manufacturer Use this thermostat only on systems with current draws that fall within the range of the heat anticipator Do not use this device on Powerpile millivolt Systems A current rating is usually stamped in the nameplate of the primary control Set the adjustable heat anticipator indicator to match the value given on the nameplate except on thermo stats used in systems as shown in Figs 2 4 See Heat Anticipator Settings Figs 2 4 If current rating is not available proceed as follows to determine the rating 1 Turn off power 2 Wire thermostat but do not mount it on the wall 3 Connect ammeter between W wire and W terminal on the thermostat 4 Prepare the system for operation 5 Turn on power 6 Turn system switch to heat 7 Increase thermostat setpoint as necessary to get system operating 8 With the system operating through the ammeter wait one minute then read the ammeter 9 Turn the system switch to OFF and turn off power 10 Adjust the heat anticipator to match the reading on
9. ol contains mercury in a sealed tube Do not place control in the trash at the end of its useful life If this control is replacing a control that contains mercury in a sealed tube do not place your old control in the trash Contact your local waste management authority for in structions regarding recycling and the proper disposal of this control or of an old control containing mercury in a sealed tube If you have questions call Honeywell Inc at 1 800 468 1502 Installation WHEN INSTALLING THIS PRODUCT 1 Read these instructions carefully Failure to follow them could damage the product or cause a hazardous condi tion 2 Check the ratings given in the Instructions and on the product to make sure the product is suitable for your applica tion 3 Installer must be a trained experienced service tech nician 4 After installation is complete check out product op eration as provided in these Instructions AN CAUTION Disconnect power supply before beginning instal lation to prevent electrical shock or equipment damage J H Rev 2 93 D e Honeywell Inc 1993 e Form Number 69 0434 5 LOCATION Locate the thermostat about 5 ft 1 5 m above the floor on an inside wall in an area with good air circulation at average temperature Do not mount the thermostat where it can be affected by drafts or dead spots behind doors or in corners hot or cold air from ducts radiant heat from th
10. olled by the thermostat in cooling and by the plenum fan control in heating In single stage heat pump and central electric heat systems fan operation is controlled by the thermostat in both heating and cooling RECALIBRATION These thermostats are calibrated at the factory and should not need recalibration If the thermostat seems out of adjust ment first check for accurate leveling To check calibration proceed as follows 1 Move the temperature setting lever to the left end low end of the temperature scale System switch must be placed at OFF Wait at least five minutes 2 Remove the thermostat cover Move the setting lever until the switch just makes contact The mercury in the switch will drop to the left end of the tube 3 Replace cover and wait five minutes for the cover and the thermostat to lose the heat it has gained from your hands If the thermometer pointer and the setting lever indicator read approximately the same no recalibration is needed If recalibration appears necessary proceed as follows 1 Place the temperature setting lever at the same setting as the thermometer Remove cover 2 Insert 104994A Calibration Wrench order separately onto the hex nut under the coil See Fig 6 Holding the setting lever soitdoes notmove turn the wrenchclockwise a until the mercury drops to the right end of the tube Remove wrench and replace cover To ensure accurate temperature control do not touch or breathe on bimet
11. the ammeter 11 Disconnect the ammeter reconnect the W wire and mount the thermostat Continue with system checkout NOTE The heat anticipator may require further adjustment for best performance To lengthen burner on time move the indicator in the direction of the longer arrows not more than a half scale marking at a time To shorten burner on time move indicator in opposite direction HEAT ANTICIPATOR SETTINGS Fig 4 only Heat Pump Systems for about 3 cycles per hour Using B Terminal Set adjustable anticipator to 140 percent of combined current draw of compressor and fan relays Using O Terminal Set adjustable anticipator to maximum scale setting Limit combined load current of compressor and fan relays to 0 8 amp because cooling anticipator provides anticipation dur ing heat cycle in this hookup Electric Systems with auto fan in heating and cooling Set adjustable anticipator to combined current draw of heating and fan relays Gas and Oil Fired Systems without auto fan in heating Set adjustable anticipator to current draw of heat relay or valve Checkout A CAUTION Do not check operation by shorting across termi nals of system controls This will damage the heat anticipator IMPORTANT To assure accurate temperature control do not touch or breathe on bimetal of thermometer HEATING With system switch set at HEAT and fan switch at AUTO move the temperature setting lever about
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